NTSB reports on flight from Chicago's emergency landing

Mechanical failure and a confusing flight manual contributed to an emergency landing involving a United flight from Chicago.

It happened in January of last year. The plane touched down in Newark, New Jersey with part of its landing gear not fully extended.

The National Transportation Safety Board found that a door on the plane did not open far enough for the landing gear to extend, and the flight manual contained an incorrect reference in a checklist dealing with the landing gear.